CN107357045A - Multi-beam synthesizer applied to synthetic aperture imaging equipment - Google Patents

Abstract

The present invention proposes a multi-beam combining device used in synthetic aperture imaging equipment, the device is mainly adjusted by the inner polygonal truncated ring, the outer polygonal truncated ring, the inner small elliptical reflector, the outer small ellipse reflector, and the outer reflector It consists of a front connecting rod of a multi-edged ring, a rear connecting rod of a multi-edged ring, a first connecting screw, a second connecting screw, a third connecting screw, a fourth connecting screw and a set screw. The inner polygonal bezel ring, the outer polygonal bezel ring, the outer mirror adjustment table, the front connecting rod of the polygonal bezel ring and the rear connecting rod of the polygonal bezel ring are made of Invar material with a small thermal expansion coefficient. The ring is connected and fixed by the front and rear connecting rods of the polygonal platform ring. The invention reduces the difficulty of optical processing, transforms the optical pyramid into a combination of small reflectors and mechanical parts, reduces the processing and manufacturing cost on the basis of ensuring optical accuracy, and greatly shortens the processing and manufacturing cycle, and the yield of the device is also high. Much higher than traditional beam combining devices.

Description

A Multi-beam Combining Device Applied in Synthetic Aperture Imaging Equipment

technical field

The invention belongs to the technical fields of optical engineering, applied optics, etc., and in particular relates to a multi-beam synthesis device used in synthetic aperture imaging equipment.

Background technique

Multi-beam synthesis devices are mainly used in synthetic aperture imaging equipment, which compresses the center distance between the sub-aperture beams in the optical equipment in equal proportions to meet the requirements of coherent synthesis imaging. In the synthetic aperture imaging device, due to the limitation of the duty cycle, the beams to be combined after compression cannot be realized by the method of patchwork of mirrors, but can only be realized by optical polygonal pyramids and peripheral matching mirrors. Among them, high-precision optical The processing of polygonal pyramids is extremely difficult, and the yield cannot be guaranteed, which limits the development of synthetic aperture imaging technology to a certain extent. However, the method of the present invention can be used to manufacture beam combining devices, which is easy to realize, has short processing period and low cost, and can promote the development of synthetic aperture imaging technology to a certain extent.

Contents of the invention

Aiming at the problems existing in the realization of the above multi-beam combining device, an easy-to-implement multi-beam combining device used in synthetic aperture imaging equipment is proposed, which can fundamentally solve the above problems.

In order to achieve the purpose of the present invention, the technical solution adopted in the present invention is: a multi-beam synthesis device used in synthetic aperture imaging equipment, which is characterized in that it includes an inner polygonal frustum ring, an outer polygonal frustum ring, and an inner small ellipse Reflector, outer small elliptical reflector, outer reflector adjustment table, front connecting rod of polygonal ring, rear connecting rod of polygonal ring, first connecting screw, second connecting screw, third connecting screw, fourth connecting screw and set screws, wherein the inner small elliptical reflector is adhered to the corresponding groove on the side of the inner polygonal platform through silica gel, and the outer small elliptical reflector is adhered to the outer reflector adjustment table through silica gel, so that it can be connected to the outer side through adjustment The set screw on the mirror adjustment table keeps the outer small elliptical mirror surface parallel to the inner small elliptical mirror surface, and the outer mirror adjustment table with the outer small elliptical mirror adhered to it is connected to the outer polygonal table by the third connecting screw At the corresponding position on the side, the front connecting rod of the polygonal truss ring and the rear connecting rod of the polygonal truss ring pass through the first connecting screw, the second connecting screw and the fourth connecting screw respectively between the inner polygonal truss ring and the outer polygonal truss ring are connected so that the corresponding surfaces of the inner polygonal truss ring and the outer polygonal truss ring are parallel to each other, and the central axes coincide.

Further, the inner polygonal frustum ring, the outer polygonal frustum ring, the outer reflector adjustment table, the front connecting rod of the polygonal frustum ring and the rear connecting rod of the polygonal frustum ring are made of Invar material with a small thermal expansion coefficient.

Further, the inner small elliptical reflector and the outer small elliptical reflector are made of quartz material whose thermal expansion coefficient is close to Invar material.

Further, the inner small elliptical mirror and the inner polygonal truncated ring are bonded with silica gel with a small elastic modulus, and the thickness of the adhesive layer is less than 0.5mm.

Further, the outer small elliptical mirror is bonded to the outer mirror adjustment table through silica gel with a small elastic modulus, and the thickness of the adhesive layer is less than 0.5mm.

Compared with the prior art, the present invention has the following advantages:

1. Invar mechanical material with low expansion coefficient is used as the main material of the multi-beam synthesis device, which greatly reduces the processing difficulty and processing cycle of the device. However, the existing synthetic devices using optical pyramids are extremely difficult to process optically, and the cost is high;

2. The beam contact area adopts small mirrors whose processing accuracy is easy to guarantee. The parallelism between the small mirrors can be adjusted steplessly through the adjustment table, which can reduce the processing accuracy of the Invar multi-edge table. Compared with the existing beam combination The device, using the device of the invention for beam combining, is easier to operate;

3. Compared with the existing beam combining method using optical pyramids and multi-reflectors, the beam combining device of the invention can be applied to imaging equipment with a smaller beam duty cycle and is more widely used.

Description of drawings

FIG. 1 and FIG. 2 are schematic diagrams of the two-dimensional structure of the multi-beam combining device used in the synthetic aperture imaging device proposed by the present invention.

Fig. 2 is the right side view of Fig. 1 .

Fig. 3 is a simplified three-dimensional structure diagram of a multi-beam combining device applied in a synthetic aperture imaging device proposed by the present invention.

Fig. 4 is a schematic diagram of the assembly and adjustment of the multi-beam synthesis device applied in the synthetic aperture imaging device proposed by the present invention, wherein Fig. 4 (a) is the first step of the assembly and adjustment method, and Fig. 4 (b) is the first step of the assembly and adjustment method second step.

Description of components in Figure 1 and Figure 2:

1—inner hexagonal platform ring, 2—outer hexagonal platform ring,

3—inside small elliptical reflector, 4—outside small ellipse reflector,

5—Outside reflector adjustment platform, 6—Hexagonal platform ring front connecting rod,

7—the rear connecting rod of the hexagonal ring, 8, 9, 10, 11—the first, second, third, and fourth connecting screws,

12—set screw.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The two-dimensional structural diagrams of the multi-beam combining device used in the synthetic aperture imaging device proposed by the present invention are shown in Figures 1 and 2, and a hexagonal truncated ring is used as an example for illustration. Fig. 2 is the right side view of Fig. 1 . Including: inner hexagonal truss ring 1, outer hexagonal truss ring 2, inner small elliptical mirror 3, outer small elliptical mirror 4, outer mirror adjustment table 5, hexagonal truss ring front connecting rod 6, hexagonal truss ring The rear connecting rod 7, the first connecting screw 8, the second connecting screw 9, the third connecting screw 10, the fourth connecting screw 11 and the set screw 12 and other parts; wherein the inner small elliptical mirror 3 and the inner hexagonal platform ring 1 The outer small elliptical reflector 4 and the outer reflector adjustment platform 5 are bonded by silica gel; the outer reflector adjustment platform 5 with the outer small elliptical reflector 4 and the outer hexagonal platform ring 2 are bonded The third connection screw 10 is connected between them; the set screw 12 connected to the outside reflector adjustment table 5 can be used to adjust the spatial position of the outside small ellipse reflector 4, so that it remains parallel to the inside small ellipse reflector 3; The inner hexagonal truss ring 1 and the outer hexagonal truss ring 2 are connected by the front connecting rod 6 of the hexagonal truss ring and the rear connecting rod 7 of the hexagonal truss ring through the first connecting screw 8, the second connecting screw 9 and the fourth connecting rod respectively. Screw 11 is connected and fixed.

Specific steps are as follows:

The first step: according to Fig. 1, Fig. 2 and Fig. 3, the structural diagram of the multi-beam combining device of the present invention is provided, and the inner hexagonal truss ring 1 and the outer hexagonal truss ring 2, the outer reflection Parts such as mirror adjusting table 5, front connecting rod 6 of hexagonal platform ring and rear connecting rod 7 of hexagonal platform ring. The inner and outer hexagonal rings can be inner and outer polygonal rings, wherein the inner and outer polygonal rings are determined according to the number of combined beams, for example, the number of combined beams is 6, then the inner and outer polygonal rings are Hexagonal ring.

Second step: according to Fig. 1, Fig. 2 and Fig. 3, the structural diagram of the multi-beam synthesis device of the present invention is provided, the inner small elliptical reflector 3 and the outer small elliptical reflector 4 are processed by quartz material, and the elastic modulus is smaller The inner small elliptical reflector 3 is bonded to the corresponding position of the inner hexagonal truss ring 1 in sequence. The outer small elliptical reflector 4 is bonded to the outer reflector adjustment table 5 sequentially by using silica gel with a smaller elastic modulus.

The third step: according to Fig. 1, Fig. 2 and Fig. 3, the structural diagram of the multi-beam combining device of the present invention is provided, and the front connecting rod 6 of the hexagonal truss ring and the rear connecting rod 7 of the hexagonal truss ring are respectively connected to the inner hexagonal At the corresponding positions of the platform ring 1 and the outer hexagonal platform ring 2, each surface of the hexagonal platform ring on the inner and outer sides is kept parallel, and the central axes coincide.

Step 4: Connect the outer reflector adjustment platform 5 to which the outer small elliptical reflector 4 is bonded in the second step to the corresponding position of the outer hexagonal truss ring 2 with the third connecting screw 10 . And install the set screws 12 on the corresponding holes of the outside reflector adjustment table 5 .

The fifth step: provide the schematic diagram of the assembly and adjustment of the multi-beam combining device of the present invention according to Fig. 4, select an autocollimator to measure and calibrate a standard plane reflector, and pre-set between the autocollimator and the standard plane reflector Leave a certain distance to ensure that multiple beam combining devices can be placed in the middle. Adjust the angle of the standard flat mirror or the autocollimator so that they are perpendicular to each other, the reading of the autocollimator shows zero, and fix the positions of the standard flat mirror and the autocollimator.

The 6th step: according to Fig. 1, Fig. 2 provides the structural diagram of the multi-beam combining device of the present invention, Fig. 4 provides the installation and adjustment schematic diagram of the multi-beam combining device of the present invention, place multiple beams between the standard plane mirror and the autocollimator The beam combining device makes the optical path of the sub-beams of the multi-beam combining device coincide with the optical path of the autocollimator. Adjust the set screw 12 and the third connecting screw 10 on the outer reflector adjustment table 5 of the multi-beam combining device, so that the outer small elliptical reflector 4 can be adjusted in any direction and at a small angle. By adjusting the angle of the outer small elliptical reflector 4 and observing that the reading of the autocollimator is zero, stop adjusting the angle of the outer small elliptical reflector 4, tighten the third connecting screw 10, and ensure that the third connecting screw 10 is locked. Immediately afterwards the autocollimator reading remains unchanged.

Step 7: Rotate the multi-beam combining device so that each sub-beam coincides with the optical path of the autocollimator, and the outer small elliptical mirror 4 on each sub-beam is sequentially adjusted and locked according to the method of the above-mentioned step 6.

The above-described embodiments are only limited to explain the present invention, and the protection scope of the present invention should include the entire contents of the claims, and those skilled in the art can realize the entire contents of the claims of the present invention through the embodiments.

Claims (5)

1. A kind of 1. multiple-beam synthesis device being applied in synthetic aperture imaging equipment, it is characterised in that：Including the more terrace with edges in inner side Before ring, the more terrace with edge rings in outside, the small elliptical reflector in inner side, the small elliptical reflector in outside, outer reflector adjustment platform, more terrace with edge rings Connecting rod, more terrace with edge ring rear connecting rods, the first attachment screw, the second attachment screw, the 3rd attachment screw, the 4th attachment screw and Holding screw, wherein the small elliptical reflector in inner side is invested in the corresponding recesses of the more terrace with edge sides in inner side by gluing, the small ellipse in outside Speculum is adjusted on platform by the gluing outer reflector that invests, and is adjusted so as to be connected to outer reflector by adjustment on platform Holding screw, make the small elliptical reflecting minute surface in outside and the small elliptical reflecting minute surface keeping parallelism in inner side, it is oval small to be stained with outside The outer reflector adjustment platform of speculum is connected on the more terrace with edge sides relevant position of outside by the 3rd attachment screw, and inner side is more The first connection is passed through by more terrace with edge ring front rods and more terrace with edge ring rear connecting rods respectively between the more terrace with edge rings of terrace with edge ring and outside Screw, the second attachment screw and the 4th attachment screw are connected, and make the more terrace with edge rings in inner side and the more terrace with edge ring corresponding surfaces in outside mutual Parallel, central axis overlaps.
2. 2. the multiple-beam synthesis device in synthetic aperture imaging equipment according to claim 1, it is characterised in that：In described The more terrace with edge rings in side, the more terrace with edge rings in outside, outer reflector adjustment platform, more terrace with edge ring front rods and more terrace with edge ring rear connecting rods By the small invar material processing and fabricating of thermal coefficient of expansion.
3. 3. the multiple-beam synthesis device in synthetic aperture imaging equipment according to claim 1, it is characterised in that：In described The small elliptical reflector of the small elliptical reflector in side and outside is made using the thermal coefficient of expansion quartz material processing close with invar material Make.
4. 4. the multiple-beam synthesis device in synthetic aperture imaging equipment according to claim 1, it is characterised in that：In described Nian Jie using the less silica gel of modulus of elasticity between the small elliptical reflector in side and the more terrace with edge rings in inner side, bondline thickness is less than 0.5mm.
5. 5. the multiple-beam synthesis device in synthetic aperture imaging equipment according to claim 1, it is characterised in that：Outside is small Elliptical reflector is Nian Jie with outer reflector adjustment platform by the less silica gel of modulus of elasticity, and bondline thickness is less than 0.5mm.